640131066002 has 16 divisors (see below), whose sum is σ = 967387993920. Its totient is φ = 317673688752.

The previous prime is 640131065993. The next prime is 640131066059. The reversal of 640131066002 is 200660131046.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1079177 + ... + 1563612.

It is an arithmetic number, because the mean of its divisors is an integer number (60461749620).

Almost surely, 2^640131066002 is an apocalyptic number.

640131066002 is a deficient number, since it is larger than the sum of its proper divisors (327256927918).

640131066002 is a wasteful number, since it uses less digits than its factorization.

640131066002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2643697.

The product of its (nonzero) digits is 5184, while the sum is 29.

Adding to 640131066002 its reverse (200660131046), we get a palindrome (840791197048).

The spelling of 640131066002 in words is "six hundred forty billion, one hundred thirty-one million, sixty-six thousand, two".